试图让Traefik识别CockroachDB仪表板

Question

• 在Windows 10上使用MiniKube
• 我按照此处的说明使用守护程序集安装了 Traefik

我使用以下命令安装了CockroachDB (CD(：

helm install --name my-release-cockroachdb stable/cockroachdb

由于这创建了服务，我希望Traefik能够找到CockroachDB仪表板，但它没有。创建的服务包括：

{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "my-release-cockroachdb-cockroachdb",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/services/my-release-cockroachdb-cockroachdb",
"uid": "00316801-a468-11e8-8b41-00155d296111",
"resourceVersion": "16247",
"creationTimestamp": "2018-08-20T10:58:42Z",
"labels": {
"chart": "cockroachdb-1.2.2",
"component": "my-release-cockroachdb-cockroachdb",
"heritage": "Tiller",
"release": "my-release-cockroachdb"
},
"annotations": {
"prometheus.io/path": "_status/vars",
"prometheus.io/port": "8080",
"prometheus.io/scrape": "true",
"service.alpha.kubernetes.io/tolerate-unready-endpoints": "true"
}
},
"spec": {
"ports": [
{
"name": "grpc",
"protocol": "TCP",
"port": 26257,
"targetPort": 26257
},
{
"name": "http",
"protocol": "TCP",
"port": 8081,
"targetPort": 8081
}
],
"selector": {
"component": "my-release-cockroachdb-cockroachdb"
},
"clusterIP": "None",
"type": "ClusterIP",
"sessionAffinity": "None",
"publishNotReadyAddresses": true
},
"status": {
"loadBalancer": {}
}
}

和

{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "my-release-cockroachdb-cockroachdb-public",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/services/my-release-cockroachdb-cockroachdb-public",
"uid": "002ec344-a468-11e8-8b41-00155d296111",
"resourceVersion": "16186",
"creationTimestamp": "2018-08-20T10:58:42Z",
"labels": {
"chart": "cockroachdb-1.2.2",
"component": "my-release-cockroachdb-cockroachdb",
"heritage": "Tiller",
"release": "my-release-cockroachdb"
}
},
"spec": {
"ports": [
{
"name": "grpc",
"protocol": "TCP",
"port": 26257,
"targetPort": 26257
},
{
"name": "http",
"protocol": "TCP",
"port": 8081,
"targetPort": 8081
}
],
"selector": {
"component": "my-release-cockroachdb-cockroachdb"
},
"clusterIP": "10.105.70.122",
"type": "ClusterIP",
"sessionAffinity": "None"
},
"status": {
"loadBalancer": {}
}
}

这最终告诉我，我可以使用：

kubectl port-forward my-release-cockroachdb-cockroachdb-0 8080

以访问 CD 仪表板。正如我认为 Traefik 已经在使用 8080 时，我编辑了服务(按照您在上面看到的使用 8081(，然后：

kubectl port-forward my-release-cockroachdb-cockroachdb-0 8081

但这会产生：

E0820 21:33:59.676164  432152 portforward.go:331] an error occurred forwarding 8081 -> 8081: error forwarding port 8081 to pod 8b7db5a2feed08f1bc329db69f9623a0c548d5ffae002236c5d7a4181ba326d3, uid : exit status 1: 2018/08/20 11:33:57 socat[44354] E connect(5, AF=2 127.0.0.1:8081, 16): Connection refused
E0820 21:33:59.681160  432152 portforward.go:331] an error occurred forwarding 8081 -> 8081: error forwarding port 8081 to pod 8b7db5a2feed08f1bc329db69f9623a0c548d5ffae002236c5d7a4181ba326d3, uid : exit status 1: 2018/08/20 11:33:57 socat[44355] E connect(5, AF=2 127.0.0.1:8081, 16): Connection refused

所以我的问题是：

1. 如何让 Traefik 自动检测 CockroachDB 服务，特别是 CockroachDB Admin GUI
2. 如何连接到 Traefik 后面的蟑螂管理 GUI？

Answer 1

helm 图表中的 cockroach-statefulset.yaml 从不在 start 命令中设置 http 端口。

您需要满足以下任一条件：

• 将 CockroachDB UI 的端口保持在:8080
• 或者：将自定义端口一直正确传递到cockroach start命令行。这可以通过--http-port标志来完成。